All ETDs from UAB

Advisory Committee Chair

Karthikeyan Lingasubramanian

Document Type


Date of Award


Degree Name by School

Doctor of Philosophy (PhD) School of Engineering


Carbon based integrated circuits (ICs) built with Carbon Nanotube Field Effect Transistor (CNTFET) and Graphene Nanoribbon Field Effect Transistor (GNRFET) are established as viable replacement for Silicon based Metal Oxide Semiconductor Field Effect Transistors (MOSFET) in order to meet the demands of future high density ICs with sub-nm channel lengths. Given the inevitability of such development, it is important to establish an understanding of the security vulnerabilities in Carbon based ICs. In this work, we have studied the important hardware security vulnerabilities that plague current MOSFET technology, in CNTFET and GNRFET based ICs. Based on our studies on hardware Trojans and IC counterfeiting, we propose efficient countermeasures for CNTFET and GNRFET based ICs. To handle IC counterfeiting, we propose Ring Oscillator based Physical Unclonable Function (RO-PUF) designs for both CNTFET and GNRFET ICs, by introducing variations in number of CNTs or GNRs in the channel. Our designs are able to achieve near ideal inter and intra hamming distances with a smaller footprint as compared to MOSFET RO-PUFs. We addressed the issue of hardware Trojans, by studying their inclusion in CNTFET and GNRFET based circuits. We used the current methodologies, designed for the detection of Trojans in MOSFET based circuits, to detect Trojans in CNTFET and GNRFET based circuits. The results clearly showed the inadequacy of these methods prompting the need for advanced detection schemes. Based on these studies, we propose a segmentation based detection methodology using sleep transistors. This power gating methodology allows us to seamlessly partition the circuit and enhance detection sensitivity.

Included in

Engineering Commons



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